ASNT NDT III ET Practice Questions - ASNT NDT Level III Electromagnetic Eddy Current Testing (ET) Method Examination Exam

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Using the standard depth-of-penetration relationship delta = 503 / sqrt(sigma * mu_r * f), with sigma in S/m, what happens to skin depth when frequency is quadrupled and all other variables are held constant?

Skin depth is reduced by a factor of four Skin depth is unchanged Skin depth doubles Skin depth is halved

Correct Answer:

Skin depth is halved

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